EP3307513A1 - Procédé de surveillance en ligne de la qualité d'une feuille et boudineuse pour feuilles pourvue d'un dispositif de surveillance en ligne de la qualité d'une feuille - Google Patents

Procédé de surveillance en ligne de la qualité d'une feuille et boudineuse pour feuilles pourvue d'un dispositif de surveillance en ligne de la qualité d'une feuille

Info

Publication number
EP3307513A1
EP3307513A1 EP16731817.9A EP16731817A EP3307513A1 EP 3307513 A1 EP3307513 A1 EP 3307513A1 EP 16731817 A EP16731817 A EP 16731817A EP 3307513 A1 EP3307513 A1 EP 3307513A1
Authority
EP
European Patent Office
Prior art keywords
film
film material
relaxation
limits
frost line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16731817.9A
Other languages
German (de)
English (en)
Other versions
EP3307513B1 (fr
Inventor
Torsten Schmitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP3307513A1 publication Critical patent/EP3307513A1/fr
Application granted granted Critical
Publication of EP3307513B1 publication Critical patent/EP3307513B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/35—Extrusion nozzles or dies with rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92076—Position, e.g. linear or angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92219—Degree of crosslinking, solidification, crystallinity or homogeneity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92428—Calibration, after-treatment, or cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92447—Moulded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92571—Position, e.g. linear or angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92942—Moulded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

Definitions

  • the invention relates to a method for online monitoring of a film quality in a production process of a plastic film and to a film machine with a device for online monitoring of a film quality in a production process of a plastic film.
  • the said production process in particular the production process for a plastic film, is stable only if the quality characteristics of the film to be produced only scatter randomly and if the characteristics only move within limits.
  • a capable process we speak of a capable process.
  • the mechanical properties of the plastic film are a major quality feature.
  • an offline quality control means that laboratory tests are carried out at defined intervals during the startup of the film machine and / or also during the production process.
  • a sample of the film produced is taken and then performed a corresponding material test in the laboratory. This ensures the adjustment phase for the production of the film and the quality assurance.
  • the respective sampling as well as the complex setting process and the quality control during the manufacturing process lead to reduced overall quality of the film, a high cost in terms of sampling and not least to a high scrap material or a large amount of so-called B-Ware.
  • the method according to the invention serves for the online monitoring of a film quality in a production process of a plastic film, in particular a blown film or a cast film.
  • a film material is led out or pulled out of an outlet device in the form of a melt lug through or via a transport device, wherein the film material cools on or in front of the transport device.
  • the transport device may be, for example, a casting roll / chill roll) to produce a cast film. It is also conceivable to integrate the method in a blown film machine in which the transport device pulls the film material out of the outlet device.
  • the transport device may be designed such that solidifies after a certain time, the film material on the transport device or in front of the transport device.
  • the solidified sheet material may be removed at a point of withdrawal from the transport device.
  • the method according to the invention provides that a determination is made of a position of a frost line in which the film material is solidified on the transport device when, for example, a cast film is produced or before the transport device when a blown film is produced.
  • a measurement is made of at least one process parameter of the solidifying film material present in the vicinity of the frost line. This means that the measurement of the above parameter can be done before or at or after the frost line.
  • the film has a transport direction which is determined, for example, by a rotation of the casting roll or, in the case of blown film, which is oriented toward the transport device, in which latter case the transport device lifts the film material upwards, opposite to the blowing head Blown film machine, pulls.
  • the method according to the invention calculates a relaxation variable that takes into account the relaxations of the molecular orientation of the film material.
  • the method according to the invention subsequently checks, to what extent the at least one relaxation variable lies within process limits. This is a decision criterion during the online monitoring regarding the film quality.
  • the varied requirements for plastic films to be produced can be reduced to the mechanical film properties which are relevant for the cohesion of the products / charges.
  • the mechanical properties are determined by the formulation and the process control, in particular the orientation of the molten film, the relaxation of the molecular orientations and the crystallization up to the freezing point (frost line) play a role.
  • Rcr relaxation occurring before or on the transport device (the orientations).
  • an initial orientation of the film material is found in that the extraction of the melt of the "thickness" of a nozzle gap of the outlet device, for example, between 0.2mm to 1 mm, especially 0.6mm and 1 mm can be considered, towards the film thickness, wherein the film thickness can be in a range for example between 2 ⁇ and ⁇ , in particular between about 6 ⁇ and 35 ⁇ .
  • the line speed and the temperature level can be mapped, as well as the specific behavior of a recipe or individual recipe components.
  • the measurement of said process parameter takes place on the frost line.
  • a different measurement i. before or after the frost line, can also be done.
  • the measurement may be sufficient at approximately 70% of the transport distance between the outlet device and the frost line.
  • a measurement at 80% or 90% or 110% or 130% is conceivable, the latter two values defining a measurement after the frost line.
  • the strong temperature-dependent relaxation is taken into account, wherein the length of impact of the film melt on the transport device can be subdivided into a suitable number of segments until the freeze line (solidification) is reached and each segment is assigned a residence time and a nominal relaxation time can.
  • the relaxation in particular the relaxation size of the film material in the transport direction, can be simulated or imaged.
  • plastic films such as Collation Shrink (blown film), Shrink Hood (blown film), Stretch Hood (blown film) or Stretch Film (casting film). or blown film
  • plastic films such as Collation Shrink (blown film), Shrink Hood (blown film), Stretch Hood (blown film) or Stretch Film (casting film). or blown film
  • Collation Shrink blown film
  • Shrink Hood blown film
  • Stretch Hood blown film
  • Stretch Film casting film
  • a frost line is to be understood as the section in the transport direction or on the transport device, in particular in the film material, in which the solidification process takes place.
  • a certain melting temperature which is in particular in the vicinity of the solidification temperature of the film material, change the crystalline structure of the film material and the entire film material solidify and solidify.
  • the film web is solidified and no longer flowable, but in a solid state. This transitional area is called the frost line.
  • the determination of the position of the frost line according to step a) takes place at least partially by means of a temperature determination of the film material.
  • the temperature determination can also be touching or contactless z. B. by means of infrared measurement.
  • one or more sensors are conceivable, which are used for the temperature determination.
  • the frost line is also conceivable according to the invention for the frost line to be determined in another way, for example by ultrasound monitoring. This is particularly advantageous in terms of a non-contact determination option.
  • This non-contact and rapid determination detects in particular forming crystalline structures in the solidification process of the film material.
  • this determination of the frost line with the determination possibilities described in this invention is freely combinable z. B. to achieve a higher speed or higher accuracy of the determination of the frost line can.
  • the determination of the frost line is at least partially carried out by a marking device, in particular a marking roller, wherein geometric markings are introduced into the solidification of the film material.
  • a marking device in particular a marking roller
  • a mechanical influence on the film material take place. Is the film material still in a flowable state, so it is still before the Frost line, so this mechanical impairment will leave geometric marks in the film material.
  • the combination is preferably provided with a camera which is able to support operators and fully automatically detect the geometric markings.
  • a marking device is movably arranged in the transport direction of the transport device or in the transport direction to the transport device for an iteration possibility.
  • the transport device may be, for example, a casting roll or a chili roll.
  • the transport device is advantageously designed cylindrical, wherein these are rotatably mounted about a rotation axis. This transport device thus rotates during the entire process for the corresponding transport and cooling of the film material arranged on its surface.
  • the determination of the frost line preferably also extends at least over a portion of this axial direction transverse to the conveying direction / transport direction of the film material.
  • a frost line is determined selectively or even continuously over the entire length of the axial orientation of the casting roll or the chili roll. This makes it possible to detect additional disadvantages or to prevent quality defects.
  • the invention may include that several measuring points are provided to measure process parameters.
  • the quality of the online monitoring can be improved by integrating several measuring points within the method in order to measure at least one process parameter which is relevant for the determination of the relaxation quantity.
  • the plurality of measuring points are located in the axial direction transversely to the transport device of the film material, so that over the width of the film material, the process parameters are measured.
  • a relaxation size can be calculated so that at different Widths of the film material transverse to the transport direction an online monitoring is performed.
  • the invention can mitumen that measuring points are provided for the measurement of process parameters, which are transverse to the frost line and / or are transverse to the predetermined direction of the transport device of the film material.
  • a measuring device can be provided which measures several process parameters across the width of the film transversely to the transport direction of the film material.
  • the measuring device may have a plurality of sensors which measure the process parameters at the respective measuring points.
  • the measuring device is designed to be traversing across the width of the film material. In the case of the traversing measuring device, it can be realized according to the invention that process parameters are determined over the entire width of the film material, which are used for the calculation of the relaxation size.
  • a respective relaxation quantity is calculated for each measuring point in order to obtain an online monitoring of the film quality across the width of the film.
  • the process parameter may be the temperature of the film material. Since the relaxation is strongly temperature-dependent, it is advantageous to measure the temperature of the film material as a process parameter. Subsequently, the relaxation quantity, in particular the relative relaxation, can be calculated at each measuring point, whereby a large number of relaxations for the relaxation variable and / or the relative relaxation variable are taken into account, in particular the relaxations starting from the relaxation from the melt flag in the transport direction to the frost line and / or are considered until shortly before or after the frost line in the relaxation size, in particular in the relative relaxation size.
  • the process model integrated in the method according to the invention determines a statement about the relative relaxation size of the solidified film, on the basis of which a statement about the quality of the film just produced can be made.
  • the relaxation variable may be at least dependent on the position of the frost line and the at least one process parameter.
  • the method according to the invention may comprise determining a relaxation variable for each measuring point in accordance with step c), wherein in step d) the individual relaxation variables are correlated to process limits. For example, it is conceivable that first the position of the frost line along the film width is determined, wherein the position is subsequently stored or stored in the method according to the invention.
  • the relaxation quantity in particular the relative relaxation variable, can be displayed as a trend function over time.
  • the possibly temporal change of the frost line position is detected via a continuous measurement of the film temperature shortly after the frost line.
  • a "geometrical" change of the frost line across the width can be detected by the measuring device Since in step d) the individual relative relaxation variables are correlated to process limits, it can be very quickly and easily visualized to the operator of a film machine when the relative relaxation quantities of the This can be defined, for example, by means of device limits, which give a statement during the check, to what extent a constancy of the relaxation variables is present and / or the relative relaxation sizes are within defined limits.
  • the method according to the invention can provide that, before the actual production process of the plastic film is started, the setup process is carried out until the relaxation variables lie within the device boundaries, in particular when the end of the device process is reached, process data of process parameters are stored.
  • the process data can z.
  • a "fingerprint" of all the process data of the film product can be stored.Also it is conceivable that after the setup process also a comparison with offline measured mechanical characteristics from the laboratory takes place.
  • the method may include that after the setup process, a calibration process takes place in a defined calibration time, in particular in which the process limits are determined or newly determined.
  • a calibration process takes place in a defined calibration time, in particular in which the process limits are determined or newly determined.
  • the set-up process there is a process which has a sufficient constancy of the relaxation variable, in particular the relative relaxation variable over time and film width, for the respective customer or the application.
  • a previously defined calibration process can start in which the process receives and calculates all relevant process parameters, in particular the relative relaxation size over the film width and time.
  • new process limits are determined or redetermined, whereby the process limits can be relaxation limits.
  • a minimum and a maximum relative relaxation is determined and then all newly determined values are compared to this value.
  • a trend function for online monitoring can be used, which consists of the ratio of O (current) to medium (average). As long as this ratio is within the previously determined limits, minimum and maximum relative relaxation, all produced films can be determined by the method according to the invention as Gutfolien. If the abovementioned limits are violated, it is conceivable that the method according to the invention recognizes this film as a poor film.
  • this film is first recognized as a film that violates the above limits.
  • the method according to the invention makes it possible to examine this film in an offline process in the laboratory. If a good quality is reported back from the laboratory, it is conceivable that the process limits are changed, in particular the area between the process limits is increased. The change of the process limits can be done automatically or manually by the operator of the film machine. It is also conceivable that during the calibration process also all process parameters are calibrated, which determine the manufacturing process and / or are relevant for the manufacturing process. This means that inter alia the melt temperature, the transport speed, in particular the speed of the chilli roll, the mass flow of the melt, the vacuum at the melt curtain, etc., are calibrated. This means that z. B.
  • the method may include determining, if the relaxation parameter, in particular the relative relaxation parameter is outside the process limits, whether a process parameter is outside its detailed process limits.
  • the use of calibrated process parameters when exceeding the process limits in the relaxation size the user or the method is given an indication of which of the detailed process limits has led to exceeding the process limits. This means that at least one of the detailed process limits could be violated, which could be the cause of a violation of the process limits related to the relaxation size.
  • the method according to the invention may include a control and / or regulation, so that it leads to a non-violation of the process limits.
  • the invention can provide a method according to the invention in which the relaxation variables and / or the process limits and / or the detailed process limits and / or the device limits and / or the process parameters are displayed and / or changed via a display unit.
  • the manufacturing process already takes place during the calibration process.
  • a high efficiency in the production process of a plastic film is achieved.
  • the user of a film machine receives up-to-date information about the film quality which is produced at this time and can act immediately when the mentioned process limits are violated.
  • An advantage of the method according to the invention is that it has the possibility of being self-learning.
  • the process limits can be changed, for example, using off-line measured values from the laboratory.
  • an analysis of the mechanical properties of the film can take place offline, for example by means of a highlight test. It can, for example, the measured values, in particular the maximum strain and the force at a certain strain, z. 70% of maximum strain, are correlated with the online determined relaxation size. For this purpose, a regression function can be fed with the entered data and a correlation quality can be determined. From a certain degree of correlation, it is possible to switch the trend function to a predicted strain or force.
  • a direct coupling with the offline test can be carried out, so that a direct assignment and transmission of the values can take place via the input of the respective roller identifier on which the produced film material is located.
  • the method according to the invention comprises that all process data of the process parameters as well as relaxation quantities relative to the respective film material located on a roll can be stored and / or transmitted further, in particular also to a winding robot in order to provide it with the exactly existing and determined one Stretching ability of the currently used film to supply, so preferably always exactly the right holding force can be used by a corresponding variation of the corresponding strain depending on the associated elasticity of the film from the winding robot.
  • a film machine with a device for online monitoring of a film quality in a production process of a plastic film.
  • a film material from an outlet device in the form of a melt flag can be brought out or pulled out by a transport device in order to cool the film material before or at the transport device until the film material solidifies.
  • the film machine has at least one measuring device for determining a position of a frost line at which the film material solidifies and for measuring at least one process parameter of the solidifying film material present in the vicinity of the frost line.
  • the process parameter can be measured before or at or after the frost line.
  • the film machine according to the invention has at least one evaluation unit for the calculation at least one relaxation size, which takes into account the relaxation of the molecular orientation of the film material, wherein the evaluation also checks to what extent the at least one relaxation size is within process limits.
  • the relaxation quantity is advantageously a value pair of calculated relaxations, in particular relative relaxations across the film width and the time, in particular from the melt tail to the frost line of the film material.
  • FIG. 1 shows an embodiment of a film machine according to the invention, an embodiment for online monitoring of a film quality in a production process of a plastic film according to FIG. 1, a possible embodiment for checking and determining when a setting-up process for the film machine has been reached, a further embodiment for checking when Process limits of the production process of a plastic film are met or exceeded, an embodiment for creating a correlation quality in the production process of a plastic film and a way to monitor online a film quality in a film machine, wherein instead of the total film width, the width of the individual film benefits is taken into account.
  • Figure 1 shows schematically a film machine 20 and a cast film machine, which has a transport device 10 which is rotatably mounted. In the transport device 10 is a chili roll 10.
  • flowable film material 1 is arranged on the surface 11 of the chili roll 10 via an outlet gap 46.
  • the chili roll 10 is cooled, so that over the contact length, a cooling rate and thus a cooling of the film material 1 is provided.
  • the solidified film material 1 is now lifted off the chili roll 10 via a tear-off roller 48.
  • FIG. 1 it is conceivable, for example, for a cleaning roller 49 to contact the film material 1.
  • This contact is used to request appropriate pollution.
  • the cleaning roller 49 is provided with a not explicitly shown adjusting mechanism, which has both a circumferential adjustment to the chili roll 10 and a radial adjustment to the chili roll axis 12.
  • the film material 1 leaves the outlet device 40 in the form of a melt lug 4.
  • the film material 1 cools down until it solidifies on a frost line FL.
  • the determination of the frost line FL takes place via a temperature determination of the film material 1 according to the embodiment shown.
  • a relative relaxation variable is used as the characteristic value which provides information about the relative molecular orientation of the frozen film for the method according to the invention.
  • the relative relaxation is temperature-dependent, whereby the circumferential angle from the impact of the melt lug 4 on the chili roll 10 until the frost line FL is reached is subdivided into a suitable number of segments and a dwell time and a nominal relaxation time are assigned to each segment.
  • a relative relaxation size can be mapped and / or calculated on the chili roll, which takes place via a process model.
  • the illustrated embodiment discloses that a plurality of relative relaxation quantities are calculated that relate to different width positions of the sheet material.
  • FIG. 2 it is shown that a plurality of measuring points 2 are present on the chili roll 10 in order to measure the process parameter P, in particular the temperature of the film material 1, transversely to the frost line FL.
  • the process model of the method according to the invention is used to calculate the relative relaxation variable.
  • FIG. 3 shows schematically how a set-up process of the method according to the invention can run with respect to time with respect to three different relative relaxation variables.
  • the relative relaxation variable is calculated and displayed as a trend function over time, which is shown in FIG. 3 as three different measuring points 2 is.
  • the representation of the trend functions in this way allows the operator or the inventive method of the film machine to approach very quickly and easily a constant process point, which carries the reference numeral 5 in Figure 3.
  • the setting-up process 6 is carried out until the relative relaxation variables lie within device limits E.
  • the facility limits E can z.
  • the relative relaxation sizes over the film width as well as over time are sufficiently constant and / or within defined submission limits. It is also conceivable that a comparison of offline measured mechanical characteristic values is carried out from the laboratory, so that at the end of the setup process 6 all process data of process parameters relating to the production process of the plastic film are stored.
  • FIG. 4 shows the ratio of the relative relaxation variable O to the mean value and the individual roll changes of the film material 1 which have been produced.
  • the graph according to FIG. 4 has the process limits Max. And Min. which have been determined by the calibration process 8.
  • the measured values can be correlated with the online-determined relative relaxation variable, which can be carried out, for example, via a regression function according to FIG.
  • the regression function is fed with the entered data and the correlation quality can be determined. From a certain degree of correlation, it is possible to switch the trend graph to, for example, a predicted strain or force.
  • a direct coupling with the offline test can take place so that a direct assignment and transmission of the values can take place via the input of the respective roll identifier on which the produced film is located.
  • FIG. 6 shows a further exemplary embodiment of the method according to the invention, in which the film thickness of the entire film material width correlates with the film thickness user-specific film thickness is shown.
  • the method according to the invention for online monitoring of a film quality can also take into account that only the user-specific width is taken into account in each case during the check as to whether the relative relaxation variables are within process limits.
  • This has the advantage that, for example, certain benefits of a total plastic film width can be determined as a good product, although there may be one or more benefits over the total plastic film width that are, for example, poor products.
  • the method according to the invention can also include the fact that during the calibration process 8 further process parameters are also calibrated, whereby detailed process limits of the process parameters are determined during the calibration process. If a process parameter according to FIG. 4 is violated with respect to the relative relaxation variable, an indication of the method or of the user which has led the process parameter to exceed the detailed process limits can be given by violating a detailed process limit. This or these process parameters can be corrected again, for example via a control unit. Also, the user can manually correct the process parameter within the detailed process limits.
  • the exemplary embodiments shown can also be related to a blown film machine not explicitly shown in which the film material 1 is drawn out of a blow head, which is the outlet device 40 according to the invention, from a spaced-apart transport device 10.
  • the transport device 10 is located above the blow head, wherein the film material is cooled by a lateral air flow and is moved in a transport direction R to the transport device 10.
  • the film material 1 passes through a transport path from the outlet device 40 to the frost line FL, as in the embodiments shown.
  • the illustrated method for online monitoring according to FIGS. 1 to 6 can also be related without any problem to the blown film machine. One difference is merely that the film material cools down in front of the transport device or solidifies in front of the transport device. B ez u s zeenlis te

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

La présente invention concerne un procédé de surveillance en ligne de la qualité d'une feuille lors d'un processus de fabrication d'une feuille de plastique, en particulier d'une feuille soufflée ou d'une feuille coulée, selon lequel du matériau pour feuille (1) sortant d'un dispositif de décharge (40) sous la forme d'un rideau de matière fondue (4) est guidé par un dispositif de transport (10), le matériau pour feuille (1) refroidissant sur le dispositif de transport (10) ou avant ce dernier, et se solidifiant avant le dispositif de transport (10) ou sur ce dernier.
EP16731817.9A 2015-06-10 2016-06-06 Procédé de surveillance en ligne de la qualité d'une feuille et boudineuse pour feuilles pourvue d'un dispositif de surveillance en ligne de la qualité d'une feuille Active EP3307513B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015109219.0A DE102015109219A1 (de) 2015-06-10 2015-06-10 Verfahren zur Online-Überwachung einer Folienqualität sowie Folienmaschine mit einer Vorrichtung zur Online-Überwachung der Folienqualität
PCT/EP2016/062810 WO2016198359A1 (fr) 2015-06-10 2016-06-06 Procédé de surveillance en ligne de la qualité d'une feuille et boudineuse pour feuilles pourvue d'un dispositif de surveillance en ligne de la qualité d'une feuille

Publications (2)

Publication Number Publication Date
EP3307513A1 true EP3307513A1 (fr) 2018-04-18
EP3307513B1 EP3307513B1 (fr) 2022-12-28

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EP16731817.9A Active EP3307513B1 (fr) 2015-06-10 2016-06-06 Procédé de surveillance en ligne de la qualité d'une feuille et boudineuse pour feuilles pourvue d'un dispositif de surveillance en ligne de la qualité d'une feuille

Country Status (5)

Country Link
US (1) US11390009B2 (fr)
EP (1) EP3307513B1 (fr)
CN (1) CN107810099A (fr)
DE (1) DE102015109219A1 (fr)
WO (1) WO2016198359A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI655073B (zh) * 2018-01-30 2019-04-01 兆邑實業有限公司 流延型押出機膜厚厚度均衡控制方法與其裝置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101614A (en) * 1975-03-03 1978-07-18 The Dow Chemical Company Blown film process
US4243619A (en) 1978-03-31 1981-01-06 Union Carbide Corporation Process for making film from low density ethylene hydrocarbon copolymer
DE4024326A1 (de) * 1990-06-06 1991-12-12 Windmoeller & Hoelscher Verfahren und vorrichtung zum verringern des durchhanges und/oder des unterschiedlichen spannungsprofils einer im blasverfahren hergestellten und flachgelegten schlauchfolienbahn
DE4118122A1 (de) * 1991-06-03 1992-12-10 Windmoeller & Hoelscher Verfahren zur bestimmung und/oder regelung des orientierungsgrades von in blasfolienanlagen hergestellten schlauchfolien
DE4137516A1 (de) * 1991-07-08 1993-01-14 Windmoeller & Hoelscher Verfahren zur regelung des durchmessers von in blasfolienanlagen hergestellten schlauchfolien
JP3945019B2 (ja) * 1997-10-28 2007-07-18 宇部興産株式会社 成形シミュレーション計算装置およびプログラム記録媒体
US6875384B1 (en) * 2002-09-06 2005-04-05 Triformix, Inc. Precision article molding methods and apparatus
EP1616687A1 (fr) * 2004-07-14 2006-01-18 Kdesign GmbH Procédé et appareil de surveillance de la production dans la fabrication de films tubulaires
US20140272305A1 (en) * 2013-03-15 2014-09-18 Davis-Standard, Llc Apparatus for manufacturing and processing pre-stretch films having strips of increased thickness

Also Published As

Publication number Publication date
US11390009B2 (en) 2022-07-19
CN107810099A (zh) 2018-03-16
US20180354183A1 (en) 2018-12-13
EP3307513B1 (fr) 2022-12-28
WO2016198359A1 (fr) 2016-12-15
DE102015109219A1 (de) 2016-12-15

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